| title | ISBN-13 (ISBN-10) | year of publication | |
|---|---|---|---|
| Group Sex. An Eyewitness Report on the American Way of Swinging | 978-0-451-90262-7 (0-451-90262-9) | 1971 | |
| Group Sex - A Scientists Eyewitness Report on the American Way of Swinging | 978-0-88326-030-2 (0-88326-030-1) | 1971 | |
| Gruppensex- Report. Über Milieu, Motive und Rituale | 978-3-10-005801-0 (3-10-005801-1) | 1982 |